Beef and ham meatballs with pecorino, fennel, and panko — mortadella is ideal, but other fine deli ham works too. Sear on all sides like a steak then finish in a simple canned tomato and basil sauce. Searing alone is not enough — they must finish in the sauce or they will be dry and tough.

Combine ground beef, finely chopped mortadella (or other fine ham), pecorino, garlic, egg, panko, salt, pepper, and fennel seeds. Mix until just combined — do not overwork. Roll into balls roughly the size of a golf ball.
Heat olive oil in a wide pan over medium-high heat. Sear the meatballs on all sides like a steak — get a crust on each side. They are not cooked through yet at this stage; that happens in the sauce.
Remove meatballs and set aside. In the same pan, add more oil if needed and fry the sliced garlic over medium heat until just golden. Add chili flakes, then pour in the canned tomatoes. Season with salt and simmer for 10 minutes.
Return meatballs to the sauce. Simmer gently for 15 minutes, turning occasionally, until cooked through and tender. Add the bunch of basil near the end. This step is essential — meatballs cooked only by searing will be tough and dry.
Cook spaghetti in well-salted boiling water until al dente. Serve topped with meatballs and sauce, chiffonaded basil, grated parmigiano, and black pepper.